/*
 * Copyright (c) 2024 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

namespace test2 {
    class Number {

    }

    class One extends Number {

    }

    class Two extends Number {

    }

    class X {
        f: Number
    }

    function newX(p: Number): X {
        let x: X = new X()
        x.f = p
        return x
    }

    function main() {
        let n1 = new One()
        let n2 = new Two()
        let x1 = newX(n1)
        let x2 = newX(n2)
        let n = x1.f
    }
}